Regex to match conditional IP address

I am wanting to grep for 192.168.22.xxx and 192.168.23.xxx. with a single grep statement where xxx can be any number.

I have tried

grep -Eo '192.168.2[2][3].[0-9]{1,3}'

and

grep -Eo '173.235.2[2][3][.][0-9]{1,3}'

But this does not retu anything. What is the correct regex I need to be using?